<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <el-container>
      <!-- 左侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse" >|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :default-active='activePath' :unique-opened='true' :collapse='isCollapse' :collapse-transition='false' router>
          <!-- 一级菜单 -->
          <!-- index用于唯一确定点开哪个菜单 绑定的属性 只接收字符串 不接收数值 所以加上一个空字符串 转换为字符串 -->
        <el-submenu :index="item.id + ''" v-for="item in menuList" :key='item.id'>
          <!-- 一级菜单模板区 -->
          <template slot="title">
            <!-- 图标 -->
            <i :class="iconsObj[item.id]"></i>
            <!-- 文本 -->
            <span>{{item.authName}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
            <!-- 二级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
      </el-aside>
      <!-- 右侧主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的连接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    // getItem（键名） 从sesstionStorage中取值
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮切换菜单折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接的激活状态
    saveNavState(activePath) {
      // 将path值存到sesstionStorage中
      window.sessionStorage.setItem('activePath', activePath)
      // console.log(activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container{
    height: 100%;
  }
  .el-header{
    background-color: #373D41;
    padding-left: 0;
    display: flex;
    // 左右贴边对齐 space-between
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;
    >div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }
  .el-aside{
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }
  .el-main{
    background-color: #eaedf1;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    // letter-spacing 间距
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
